SLIDESHOW: Guess who’s been hacked lately

Hackers at work

The hacking of Burger King’s Twitter account Monday had some observers laughing, but hacking is a serious matter. The Virginia-based cybersecurity firm Mandiant, in a report released today, alleges that Chinese military unit 61398 is behind hacks on 115 targets in the United States, including Coca Cola, Lockheed Martin and Google. The Chinese government has repeatedly denied any involvement, but it's a federal priority for President Barack Obama, who recently signed an executive order with new rules for cybersecurity. "We cannot look back years from now and wonder why we did nothing in the face of real threats to our security and our economy," the president said in his State of the Union address. Click through for a look at some of the hacks on U.S. companies that have taken place or been revealed in 2013.

Burger King and Jeep

A hacker broke into Burger King’s Twitter account on Monday, announcing "We just got sold to McDonalds!" and then posting obscene messages and changing its profile picture to a McDonald’s logo, complete with a photo of the new Fish McBites. The Golden Arches corporate site tweeted, "Rest assured, we had nothing to do with the hacking." Today, Jeep got hacked too, apparently by the same culprits, who used a Cadillac logo on its page. These tweets amused some, but other high-profile hacks weren't funny.

Twitter

Facebook

The social network announced on Friday that it had been "targeted in a sophisticated attack" that occurred last month, in which a handful of employers visited a mobile developer website that was compromised, allowing malware to be installed on those employee laptops. "As soon as we discovered the presence of the malware, we remediated all infected machines, informed law enforcement, and began a significant investigation that continues to this day," the blog post said, adding in bold: We have found no evidence that Facebook user data was compromised.

Facebook

Apple

Apple announced today that a few of its employees' computers had been hacked after visiting a developer website that contained malware, similar to what happened to Facebook last week, but it said that no data was exposed. It was unclear when the hack happened. This follows an announcement last week of a security flaw in Apple's iOS 6.1, the operating system that was introduced on its iPhone5. The flaw lets anyone who gets their hands on your phone to bypass the iPhone password lock and access apps, contacts, voicemail, and photos. In order to achieve the hack, users must come close to turning off the iPhone, place an emergency call, and keep their finger on the power button, a video on YouTube revealed, as Verge reported on February 14. Apple said it is working on a fix that will require a software update.

Bloomberg

Jawbone

Last week, Jawbone reported that it had been hacked and that those with Jawbone headsets and MyTALK accounts might have received emails warning that they would need to reset their passwords due to a security compromise in a "limited" number of accounts. According to reports last Thursday, the company said it halted the hack after "several hours," however, and that thieves only stole names, email addresses and encrypted passwords—but no other user information, so far as it can tell.

The New York Times

On January 30, the New York Times reported that hackers from China had spent at least four months searching the newspaper’s network, and stealing the passwords of reporters in an apparent attempt to identify sources and gather intel on articles related to the family of China’s prime minister.